ASP.NET PDF Viewer using C#, VB/NET

Ask us anything (technical) about Oracle, and if we can t find the answer (whether it be yes, no, or a solution) within 24 hours, the person who asked the question gets a T-shirt stating that he or she beat the OakTable The Challenge, though, is not used as much as we d like, probably because it looks as if we want to be challenged with questions to which we cannot find answers The opposite is actually true the purpose is to answer questions from anybody, regardless how simple or easy they might seem..

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ASPNET 20 adds a suite of controls to the Framework called data source controls These controls keep in line with Microsoft s migration from imperative code to declarative code Data source controls allow data to be retrieved from a variety of sources using nothing but markup in the body of the ASPX page If you re having flashbacks to the days of IDC and HTX, you re not entirely off base, but these controls are extremely flexible and powerful Another benefit of the markup approach to declarative coding is that the XML DOM is much easier to use than the CodeDOM, and so there s really impressive support for these controls from within the Visual Studio IDE graphical editors These tools generate the markup, exposing an interface that allows for some powerful expressions to be created without writing any code.

Often you will need to raise additional events from objects that follow the BackgroundWorker design pattern. For example, let s say you want to augment IterativeBackgroundWorker to raise an event when the worker starts its work and for this event to pass the exact time that the worker thread started as an event argument. Listing 13-3 shows the extra code you need to add to the IterativeBackgroundWorker type to make this happen. We use this extra code in the next section. Listing 13-3. Code to Raise GUI-Thread Events from an IterativeBackgroundWorker Object open System open System.Threading type IterativeBackgroundWorker<'a>(...) = let worker = ... // The constructor captures the synchronization context. This allows us to post // messages back to the GUI thread where the BackgroundWorker was created. let syncContext = SynchronizationContext.Current do if syncContext = null then failwith "no synchronization context found" let triggerStarted,started = IEvent.create()

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l_component_id components_or_view.component_id%type; begin for i in 1..g_num_of_child_updates loop l_component_id := mod(i,500); update table ( select parts from components_or_view where component_id = l_component_id ) set part_desc = part_desc || ' updated' where part_id = i; end loop; end do_or_update;

Still, as architects, our hunch is that you ll look at some of these tools and wince a little on the inside They demo really well at the conferences, but for a lot of people, there s something about embedding data access code into markup that just somehow seems wrong Data access belongs in a different logical layer of the application, and presentation code belongs in markup This opinion may change over time, and XML Application Markup Language (XAML) may bring about changes in the way people think about coding and markup But these are changes that may take many years to take hold, and, in the meantime, if these controls don t live up to their promise, they could undermine any eventual adoption of this model.